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EP1690047B1 - Capteur solaire - Google Patents

Capteur solaire Download PDF

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Publication number
EP1690047B1
EP1690047B1 EP04797618A EP04797618A EP1690047B1 EP 1690047 B1 EP1690047 B1 EP 1690047B1 EP 04797618 A EP04797618 A EP 04797618A EP 04797618 A EP04797618 A EP 04797618A EP 1690047 B1 EP1690047 B1 EP 1690047B1
Authority
EP
European Patent Office
Prior art keywords
tube
solar collector
parabolic
absorber
solar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04797618A
Other languages
German (de)
English (en)
Other versions
EP1690047A1 (fr
Inventor
Thomas Kuckelkorn
Christina Hildebrandt
Martin Eickhoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schott AG
Original Assignee
Schott AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schott AG filed Critical Schott AG
Priority to EP06016603A priority Critical patent/EP1712852B1/fr
Publication of EP1690047A1 publication Critical patent/EP1690047A1/fr
Application granted granted Critical
Publication of EP1690047B1 publication Critical patent/EP1690047B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/75—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with conical reflective surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
    • F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/74—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with trough-shaped or cylindro-parabolic reflective surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/79—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with spaced and opposed interacting reflective surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/80—Accommodating differential expansion of solar collector elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems

Definitions

  • the invention relates to a solar collector with an absorber tube, with a concentrating solar radiation on the absorber tube concentrator and with at least two surrounding the absorber tube radiation-permeable sheaths, being provided in connecting areas between the sheaths compensating pieces for length compensation.
  • Concentrators are devices that focus the solar radiation on the absorber tube. It may be e.g. to act at optical devices. Preference is given to parabolic mirrors, which are designed as a groove. The radiation reflected at such parabolic troughs is concentrated in a focal line in which the absorber tube and the cladding tube are arranged. Such parabolic troughs can also consist of several channel segments with their own radii of curvature and their own focal lines.
  • the hot selectively coated absorber tube is surrounded by a cladding tube made of glass, and the space between cladding tube and absorber tube is evacuated.
  • the absorber tubing consists of a plurality of pipe sections, which are arranged one behind the other and welded together. At the connection areas metal supports engage in order to keep the absorber tube in the focal line of the parabolic trough collector. In the irradiated state, the hot absorber tube expands more strongly than the cooler cladding tube. For this reason, in commercial absorber pipes, which are known for example from WO 03/042609 A, compensating pieces are provided between the ducts.
  • shims are usually made of metal bellows, which bridge the distance between the sheaths and compensate for different length expansions.
  • the balancing pieces are protected by radiation protection elements, such as. z. As by aluminum sheets, shaded by the concentrated solar radiation, especially to protect the glass-metal welded joints from excessive temperature gradients.
  • the invention has for its object to provide a solar collector with improved utilization of the incident radiation energy.
  • the solar collector according to the invention has the features of claim 1. After this, at least one mirror collar surrounding the cladding tube, which has at least one planar surface, is arranged in the connecting regions.
  • the mirror collar forms a secondary reflector, which reflects the concentrated solar radiation from the connection area into the area of active absorber tube surface.
  • the fully or partially circumferential mirror collar has the ability to reflect the concentrated solar radiation coming from different directions from the parabolic mirrors, even at different angles of incidence of the sun, onto the active absorber tube surface. Although a part of the absorber tube length can be covered by the mirror collar, the solar radiation impinging on this part is guided by secondary reflection into the absorbing length region of the absorber tube.
  • Plane surfaces have the further advantage over a cone surface that the radiation is not divergent reflected, but that the reflection corresponds to an optical axis font.
  • the focus is maintained within the focal line, whereby a further increase in performance can be achieved.
  • the planar surface is preferably aligned perpendicular to the axis of the cladding tube.
  • the planar surface is an annular surface.
  • the annular surface may extend over the entire circumference of the cladding tube or as a partial annular surface only over a portion.
  • a preferred embodiment provides a plurality of planar surfaces which are arranged on a cone. Obtained in this way plan facet surfaces whose envelopes form a cone. This arrangement is particularly advantageous when the concentrator is a parabolic trough, which consists of several parabolic segments, each having their own radii of curvature.
  • the concentrator is a parabolic trough, which consists of several parabolic segments, each having their own radii of curvature.
  • at least one planar surface is assigned to one parabolic segment in each case. This means that the planar surface is arranged on the Konusf kaue that impinges the parabolic segment belonging focal line on the relevant plane surface.
  • two planar surfaces are assigned to a parabolic segment.
  • the one surface of the surface pair on the parabolic trough remote from the half of the cone and the second surface on the parabolic trough facing half of the cone is arranged.
  • the mirror collar accordingly preferably has four to eight planar surfaces.
  • the ratio h through L is preferably between 0.3 to 1, where h is the height of the mirror collar perpendicular to the axis of the cladding tube and L is the length of the connecting region.
  • the ratio is preferably to be chosen so that the shading length V is smaller year-round than the length L of the connection region. This in turn depends on the location where the solar panel is installed and thus on the angle of solar radiation.
  • the mirror collar is preferably made of aluminum.
  • a parabolic trough collector 10 having an elongate parabolic reflector 11 of parabolic profile.
  • the parabolic reflector 11 is provided with an existing framework of a support structure 12.
  • an absorber tube 13 which is fixed to supports 14, which are connected to the parabolic reflector.
  • the parabolic reflector forms with the supports 14 and the absorber tube 13 a unit which is pivoted about the axis of the absorber tube and thereby the state of the sun S uniaxial tracked.
  • the incident of the sun S parallel solar radiation is focused by the parabolic reflector 11 on the absorber tube 13.
  • the absorber tube is driven by a heat transfer medium, e.g. Water or oil, flows through and heated by the absorbed solar radiation. At the outlet end of the absorber tube, the heat transfer medium can be removed and fed to a heat exchanger or another energy consumer.
  • a heat transfer medium e.g. Water or oil
  • Fig. 2 shows the absorber tube 13, which consists of several pipe sections and is surrounded by cladding tubes 15 made of glass.
  • the cladding tubes 15 serve to reduce thermal convection losses and heat radiation losses in the high temperature range.
  • the space between the absorber tube 13 and the cladding tube 15 is evacuated.
  • the absorber tubing consists of a large number of absorber tubes, which are connected to one another.
  • the supports 14 engage.
  • the connection points 16 are therefore not covered by the cladding tube 15.
  • compensating pieces 17 are welded in the form of a metal bellows to the absorber tube ends.
  • the shims 17 ensure a flexible metal-glass transition so as to compensate for the different length expansions.
  • a mirror collar 20 surrounding the absorber tube or the cladding tube 15 is disposed in the connecting region between two adjacent cladding tubes 15, which in this exemplary embodiment has a truncated cone shape circulating through 360 °.
  • the mirror collar 20 is mirrored on the outside. It has a wide conical end 20a of large diameter and opposite a narrow cone end 20b of smaller diameter. The diameter of the cone end 20b is equal to the outer diameter of the cladding tube 15.
  • the mirror collar 20 adjoins the end of the cladding tube 15, and it covers the connection region 50 to the adjacent cladding tube 15 on at least part of the tube length.
  • a shim 17 is contained in the cavity enclosed by the mirror collar.
  • a second (not shown) mirror collar may be located beyond the junction 16 and cover the other bellows 17. The two mirror collars are then facing each other with their large ends 20a. In between is the support 14.
  • the mirror collars 20 have the effect that the incident solar radiation SR is reflected at the conical mirror surface and thrown onto the adjacent absorber tube 13. It can be seen that the solar radiation SR striking the connection region between the tubes is deflected by the mirror collar 20 onto the exposed region of the absorber tube 13 and passes through the jacket tube 15 to the absorber tube. In this way, the energy yield of the parabolic trough collector 10 is improved.
  • FIG. 3 schematically shows, in a perspective view, an arrangement with absorber tubes and cladding tubes 15, wherein the connecting region 50 in which the compensating elements are arranged is covered by an insulated radiation protection element.
  • the connection region or the insulated radiation protection element 50 has the length L.
  • a mirror collar 20 is arranged, which has a planar surface 30 in the form of a perpendicular to Pipe axis employee ring 31 has.
  • H denotes the height of the ring 31.
  • FIG. 4 a shows an embodiment with a parabolic reflector 11 having four parabolic segments 11 a - 11 d.
  • the focal lines belonging to the parabolic segments are not shown in FIG. 4a, but lie in the region of the absorber tube or cladding tube 15.
  • the solar radiation SR is incident at the angle ⁇ , which is also shown in FIG. 4b.
  • ⁇ denotes the angle of incidence of the solar radiation
  • L the length of the connection region
  • V the shading length.
  • V is smaller than the length L, so that at the illustrated angle of incidence ⁇ the cladding tube 15 to the right of the connection region 50 is not shaded.
  • a further embodiment of the mirror collar 20 is shown, which has a total of six planar surfaces 30 which are arranged inclined to the axis of the cladding tube 15.
  • the planar surfaces 30 form facet surfaces on a cone surface.
  • the optical efficiency is increased by radiation that would otherwise be incident on the connection region and would be reflected back to the parabolic mirror, in addition to the cladding tube or the absorber tube is directed.
  • the mirror collar 20 is mounted on an installation in the northern hemisphere on the south side of the transition area.
  • the mirror collar can be arranged at an angle ⁇ of 90 ° as an annular disk 31 up to an angle ⁇ of 45 ° as a mirror collar 20 with planar surfaces 30.
  • the profits are highest in winter, for smaller angles the profits increase in the summer, while the profits decrease in the winter.
  • the amount of profits and losses depends on the geographical location, the orientation of the solar collector and the distance of the height of the adjacent solar collectors, which is referred to as horizon shading.
  • FIG. 8 shows the shading (horizon shading) as a function of the local time for the 21st of March / September.
  • the value T on The right-hand y-axis indicates total shading by the neighboring solar panel (s).
  • Figures 9 and 10 show the corresponding curves for 21st June and 21st December.
  • FIGS. 11 to 13 show corresponding diagrams for the ratio h / L of 0.55.
  • the ratio h / L 0.55 has the result that the shading length V is smaller year-round than the length L of the connection region, as shown in Fig. 4b. This results in only solar gains and losses on the south side of the connection area. There are no losses due to shading of the absorber pipe on the north side. Losses occur in the summer in the morning and evening hours. During this time, the solar collector is partially shaded by the horizon shading, which reduces the performance-related losses.
  • the mirror collar can also be mounted at an angle ⁇ ⁇ 90 ° to the axis of the cladding tube. This increases the profits in the summer half-year and the losses in the morning and evening hours are reduced.
  • the individual flat surfaces 30 prevent optical expansion of the focus line.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Photovoltaic Devices (AREA)
  • Mounting And Adjusting Of Optical Elements (AREA)

Claims (8)

  1. Collecteur solaire comprenant un tube absorbant (13), comprenant un concentrateur qui concentre le rayonnement solaire sur le tube absorbant, au moins deux tubes d'enveloppe (15) qui entourent le tube absorbant (13) de manière à laisser passer le rayonnement, des éléments de compensation (17) pour la compensation en longueur étant prévus dans les zones de liaison (50) entre les tubes d'enveloppe, caractérisé en ce que dans les zones de liaison (50) est disposé au moins un collet à miroir (20) entourant le tube d'enveloppe (15) et qui présente au moins une surface plane (30).
  2. Collecteur solaire selon la revendication 1, caractérisé en ce que la surface plane (30) est dirigée perpendiculairement à l'axe du tube d'enveloppe (15).
  3. Collecteur solaire selon la revendication 1 ou 2, caractérisé en ce que la surface plane (30) est une surface annulaire (31).
  4. Collecteur solaire selon la revendication 1, caractérisé en ce que le collet à miroir (20) présente plusieurs surfaces planes (30) qui sont disposées sur un cône.
  5. Collecteur solaire selon la revendication 4, caractérisé en ce que le collet à miroir présente quatre à huit surfaces planes (30).
  6. Collecteur solaire selon la revendication 5, comprenant un réflecteur parabolique (11) composé d'au moins deux segments de parabole (11a - d), caractérisé en ce qu'au moins une surface plane (30) est à chaque fois associée à un segment de parabole (11a-d) respectif.
  7. Collecteur solaire selon l'une des revendications 1 à 6, caractérisé en ce que le rapport h/L est compris entre 0,3 et 1, h désignant la hauteur du collet à miroir (20) perpendiculairement à l'axe du tube d'enveloppe (15) et L la longueur de la zone de liaison (50).
  8. Collecteur solaire selon l'une des revendications 1 à 7, caractérisé en ce que le collet à miroir (20) est en aluminium.
EP04797618A 2003-11-04 2004-11-04 Capteur solaire Expired - Lifetime EP1690047B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06016603A EP1712852B1 (fr) 2003-11-04 2004-11-04 Collecteur solaire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10351474A DE10351474B3 (de) 2003-11-04 2003-11-04 Parabolrinnenkollektor
PCT/EP2004/012493 WO2005045329A1 (fr) 2003-11-04 2004-11-04 Capteur solaire

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP06016603A Division EP1712852B1 (fr) 2003-11-04 2004-11-04 Collecteur solaire

Publications (2)

Publication Number Publication Date
EP1690047A1 EP1690047A1 (fr) 2006-08-16
EP1690047B1 true EP1690047B1 (fr) 2007-03-14

Family

ID=34428554

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06016603A Expired - Lifetime EP1712852B1 (fr) 2003-11-04 2004-11-04 Collecteur solaire
EP04797618A Expired - Lifetime EP1690047B1 (fr) 2003-11-04 2004-11-04 Capteur solaire

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP06016603A Expired - Lifetime EP1712852B1 (fr) 2003-11-04 2004-11-04 Collecteur solaire

Country Status (7)

Country Link
US (2) US7240675B2 (fr)
EP (2) EP1712852B1 (fr)
CN (1) CN100529583C (fr)
DE (2) DE10351474B3 (fr)
ES (2) ES2251320B1 (fr)
IL (1) IL175167A0 (fr)
WO (1) WO2005045329A1 (fr)

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DE10231467B4 (de) * 2002-07-08 2004-05-27 Schott Glas Absorberrohr für solarthermische Anwendungen
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013201409B3 (de) * 2013-01-29 2014-07-10 Schott Solar Ag Haltevorrichtung für Absorberrohre
WO2014118153A1 (fr) 2013-01-29 2014-08-07 Schott Solar Ag Absorbeur et dispositif de maintien pour tubes d'absorbeur
US10184691B2 (en) 2013-01-29 2019-01-22 Rioglass Solar Holding, S.A. Absorber and retaining device for absorber tubes

Also Published As

Publication number Publication date
DE10351474B3 (de) 2005-05-12
US7240675B2 (en) 2007-07-10
EP1690047A1 (fr) 2006-08-16
DE502004003248D1 (de) 2007-04-26
CN1875227A (zh) 2006-12-06
EP1712852A1 (fr) 2006-10-18
CN100529583C (zh) 2009-08-19
ES2281844T3 (es) 2007-10-01
WO2005045329A1 (fr) 2005-05-19
IL175167A0 (en) 2006-09-05
ES2251320B1 (es) 2006-12-16
US20050139210A1 (en) 2005-06-30
EP1712852B1 (fr) 2007-08-22
US20070095340A1 (en) 2007-05-03
US7637259B2 (en) 2009-12-29
ES2251320A1 (es) 2006-04-16

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